Maven unpack dependencies from Ant plugin mojo

Maven unpack dependencies from Ant plugin mojo

I have a Maven ant plugin that bundles up a library of Ant tasks. One of
them has a lot of CI tasks.
I have the plugin working and can hit the task by running
mvn -U ci:options
This brings up a menu for the different operations.
The issue i'm having is that I need to resolve dependencies in the pom
before the task is executed.
From reading up I would have thought that I could add
<execution>
<goal>dependency:unpack-dependencies</goal>
</execution>
To the pluginMetaData xml file that defines the mojo, though this doesn't
seem to do anything
ci.mojos.xml
<pluginMetadata xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/plugin-metadata-1.0.0.xsd">
<mojos>
<mojo>
<!-- target name to call in ant script -->
<call>run</call>
<!-- mojo goal name -->
<goal>options</goal>
<execution>
<goal>dependency:unpack-dependencies</goal>
</execution>
<parameters>
<parameter>
<name>artifactId</name>
<property>artifactId</property>
<required>true</required>
<readonly>true</readonly>
<type>java.lang.String</type>
<defaultValue>${project.artifactId}</defaultValue>
<description>Project Artifact Id</description>
</parameter>
....
ci.build.xml
<property name="project.home" location="."/>
<property name="target.dir" value="${project.home}/target"/>
<property name="build.dir" value="${target.dir}/build"/>
<property name="dependency.dir" value="${target.dir}/dependency"/>
<!-- Add contrib to the classpath -->
<taskdef resource="net/sf/antcontrib/antlib.xml"/>
<!-- Include ant utils from the shared resource -->
<include file="${dependency.dir}/shared_ant/build.xml"/>
<!-- Continuous Integration Options -->
<target name="run" description="Continuous Integration Options">
<ci.options/>
</target>
</project>
Any help greatly appreciated.
James